[PATCH v3 7/9] videobuf2/videobuf2-dma-sg.c: Convert to use vm_insert_range

[Souptick Joarder]

Convert to use vm_insert_range to map range of kernel memory
to user vma.

Signed-off-by: Souptick Joarder <jrdr.li...@gmail.com>
Reviewed-by: Matthew Wilcox <wi...@infradead.org>
Acked-by: Marek Szyprowski <m.szyprow...@samsung.com>
---
 drivers/media/common/videobuf2/videobuf2-dma-sg.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c 
b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 015e737..898adef 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -328,28 +328,19 @@ static unsigned int vb2_dma_sg_num_users(void *buf_priv)
 static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma)
 {
        struct vb2_dma_sg_buf *buf = buf_priv;
-       unsigned long uaddr = vma->vm_start;
-       unsigned long usize = vma->vm_end - vma->vm_start;
-       int i = 0;
+       unsigned long page_count = vma_pages(vma);
+       int err;
 
        if (!buf) {
                printk(KERN_ERR "No memory to map\n");
                return -EINVAL;
        }
 
-       do {
-               int ret;
-
-               ret = vm_insert_page(vma, uaddr, buf->pages[i++]);
-               if (ret) {
-                       printk(KERN_ERR "Remapping memory, error: %d\n", ret);
-                       return ret;
-               }
-
-               uaddr += PAGE_SIZE;
-               usize -= PAGE_SIZE;
-       } while (usize > 0);
-
+       err = vm_insert_range(vma, vma->vm_start, buf->pages, page_count);
+       if (err) {
+               printk(KERN_ERR "Remapping memory, error: %d\n", err);
+               return err;
+       }
 
        /*
         * Use common vm_area operations to track buffer refcount.
-- 
1.9.1